Flavobacterium columnare is a thin Gram-negative rod bacterium of the genus Flavobacterium. Fish with columnaris usually have brown to yellowish-brown lesions (sores) on their gills, skin and/or fins. The bacteria attach to the gill surface, grow in spreading patches, and eventually cover individual gill filaments. This results in cell death.

Flavobacterium columnare is a thin Gram-negative rod bacterium of the genus Flavobacterium. Fish with columnaris usually have brown to yellowish-brown lesions (sores) on their gills, skin and/or fins. The bacteria attach to the gill surface, grow in spreading patches, and eventually cover individual gill filaments. This results in cell death.

Piscirickettsia salmonis is a gram-negative obligate intracellular bacterium that causes systemic septicaemia (salmonid rickettsial syndrome, SRS, or piscirickettsiosis) in salmonid fish Piscirickettsia-like bacteria are now been recognized with increasing frequency in a variety of other fish species, from both fresh and salt waters around the world.

Piscirickettsia salmonis is a gram-negative obligate intracellular bacterium that causes systemic septicaemia (salmonid rickettsial syndrome, SRS, or piscirickettsiosis) in salmonid fish Piscirickettsia-like bacteria are now been recognized with increasing frequency in a variety of other fish species, from both fresh and salt waters around the world.

Bacterial kidney disease (BKD) is caused by Renibacterium salmoninarum, a coryne form, rod-shaped, Gram-positive. BKD occurs in North America, Japan, Western Europe and Chile. R. salmoninarum infections can buildup over a long period of time, with clinical disease only appearing in advanced infections, usually when the fish have completed their first year of life.

Bacterial kidney disease (BKD) is caused by Renibacterium salmoninarum, a coryne form, rod-shaped, Gram-positive. BKD occurs in North America, Japan, Western Europe and Chile. R. salmoninarum infections can buildup over a long period of time, with clinical disease only appearing in advanced infections, usually when the fish have completed their first year of life.

Streptococcus iniae is a Gram-positive bacterium and a severe aquaculture pathogen that can infect a wide range of farmed fish species. It causes meningoencephalitis in tilapia, yellowtail, rainbow trout, and coho salmon and has been associated with disease outbreaks in aquaculture farms, with mortality rates of up to 50%.

Streptococcus iniae is a Gram-positive bacterium and a severe aquaculture pathogen that can infect a wide range of farmed fish species. It causes meningoencephalitis in tilapia, yellowtail, rainbow trout, and coho salmon and has been associated with disease outbreaks in aquaculture farms, with mortality rates of up to 50%.

Streptococcus phocae a Gram-positive, catalase-negative cocci, was frequently involved in disease outbreaks in seals causing pneumonia or respiratory infection. Further studies described isolations of this species from Atlantic salmon, Salmo salar, causing serious economic losses in the salmon industry.